The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 25, 2011
Filed:
Oct. 07, 2005
Jun Maede, Kyoto, JP;
Masanori Fujisawa, Kyoto, JP;
Jun Maede, Kyoto, JP;
Masanori Fujisawa, Kyoto, JP;
Rohm Co., Ltd., Kyoto, JP;
Abstract
An organic EL drive circuit and an organic EL display device is capable of preventing sticking of a display screen of the organic EL panel due to reduction of an output current of a relatively high withstand voltage transistor of a D/A converter circuit. In particular, an analog converted current is obtained at a predetermined output terminal of a D/A converter by connecting a plurality of series-connected relatively high withstand voltage transistors between an output side of the D/A converter constructed with a current mirror circuit and an output terminal of the D/A converter and using low withstand voltage transistors as output side transistors of the D/A converter. Therefore, the output side transistors of the D/A converter can be replaced by low withstand voltage transistors similar to the input side transistors, so that the area occupied by the D/A converter can be reduced.